It has been about 2 years since Ultra, innovator of the modular cable power supply, has introduced a new line of power supplies; the Ultra x3 series was available in wattages up to 1000 Watts. With their latest offering, the x4, Ultra ups the ante with a 1600 Watt model, along with a 500, 600, 850, 1050, and 1200 Watt standard ATX units, as well as a micro ATX 400 Watt unit. Today we are going to look at the 600 and 1050 Watt versions.